# Deploy changes to active rootfs partition

**URL:** <https://hub.mender.io/t/deploy-changes-to-active-rootfs-partition/3771>\
**Category:** General Discussions\
**Tags:** mender-artifact\
**Created:** [June 18, 2021, 12:56pm UTC](https://hub.mender.io/t/deploy-changes-to-active-rootfs-partition/3771 "2021-06-18T12:56:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Dirk](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/dirk/32/1289_2.png) [@Dirk](https://hub.mender.io/u/Dirk)\
**Post date:** [June 18, 2021, 12:56pm UTC](https://hub.mender.io/t/deploy-changes-to-active-rootfs-partition/3771/1 "2021-06-18T12:56:19Z")

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Hi,

I have a running (test-) mender setup, that will be work fine. But, how can I apply a mender-artifact without to lost some data. The customer will use docker container and AWS IoT with greengrass. In case of a new mender deployment, the mender client will switch the active/passiv configuration.

If there any type of deployment, which will only update the active partition?

Thanks  
Dirk

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**Author:** ![drewmoseley](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/drewmoseley/32/47_2.png) [@drewmoseley](https://hub.mender.io/u/drewmoseley)\
**Post date:** [June 18, 2021, 4:19pm UTC](https://hub.mender.io/t/deploy-changes-to-active-rootfs-partition/3771/2 "2021-06-18T16:19:19Z")

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Hi @Dirk,

Yes, you can use a custom Update Module for that. The following links should help explain it:

- [What Is a Mender Update Module, How It Works and Why Use It? | Mender](https://mender.io/blog/what-is-a-mender-update-module-how-it-works-and-why-use-it)
- [Create a custom Update Module | Mender documentation](https://docs.mender.io/artifact-creation/create-a-custom-update-module)
- [Update Modules - Mender Hub](https://hub.mender.io/c/update-modules/13)

Drew